A knife with one handle with enterchangeable blades thats pretty cool. Think I would have skipped sunscreen and bug spray (more weight and SPACE)and just picked some up down there. I think you can get away with a small save a dive kit and a small first aid kit. At least an o-ring kit and something to stop blood from going all over. Also the keys are filled with dive shops so things you might need to make a repair are very nearby.
Kershaw Deluxe Blade Trader Knife at The Kershaw Store
This is the newer version of the knife set. As for the sunscreen, the resort we are going to is on it own island and I'm cheap. I can't even imagine how much they would charge for a bottle of sunscreen and bug spray. Of course if it puts me overweight I'd leave it home.